Which muscle performs the function of moving the eye medially and in?

The muscle responsible for moving the eye medially is the medial rectus. This muscle is one of the extraocular muscles and plays a crucial role in eye movement. When the medial rectus muscle contracts, it pulls the eye inward, towards the nose, allowing for the medial movement or adduction of the eye.

In the context of eye movements, each of the extraocular muscles has a specific function. The lateral rectus abducts the eye, moving it laterally away from the nose. The inferior oblique primarily elevates and rotates the eye outward, while the superior rectus elevates and can also rotate the eye medially. However, none of these muscles perform the medial movement like the medial rectus, which is specifically designed for that action. Thus, the proper identification of the medial rectus as the muscle that moves the eye medially is accurate.